To lend a hand
کمک کردن

In hot water
در مشکل بودن

you bet
حتما ، البته!

Hit the books
درس خواندن

Seconded
http://www.urbandictionary.com/define.php?term=I%20second%20that

When you agree with some proposal, for instance:
A- I think we should get some new members for our site.
B- I second that.
or
B- Seconded.

Learn English as easy as pie

absquatulate — leave abruptly
anomalous — deviating from normal
argle-bargle — extensive meaningless writing or talk
argy-bargy — noisy arguing
awkward — causing difficulty
bauble — small trinket or decoration
blimp — an inflated airship
blubber — the fat of sea mammals, or to cry noisily
blue-footed booby — large tropical seabird
bodacious — excellent, attractive
bouffant — hairstyle with a rounded puffed up shape
brouhaha — loud, overexcited display
bumblebee — large bee
bumf — useless and dull documents
bungalow — low house
burgoo — stew or thick soup
cahoots — conspiring (in cahoots)
canoodle — kiss and cuddle
cantankerous — grumpy and argumentative
chinchilla — South American rodent with soft fur
chocks — wedges to stop a wheel from moving
codswallop — nonsense
collywobbles — stomach pain, queasiness from anxiety
conniption — fit of rage or hysterics
crapulent — relating to drinking alcohol
cummerbund — a wide sash
defenestrate — throw out of a window
diphthong — sound made by combining two vowels in one syllable
discombobulate — confuse someone
dollop — blob of soft food
doodle — draw absentmindedly
doozy — outstanding or unique thing
drizzle — light rain, or to trickle a thin stream of something over food
effluvium — unpleasant smell or secretion
ensorcell — enchant, captivate
euphonium — small tuba
fartlek — distance runners' training system
fatuous — foolish
feeble — lacking physical strength
finagle — get by dishonest means
firkin — small cask
flabbergasted — greatly astonished
flibbertigibbet — frivolous, chatty person
flume — narrow water channel
flummox — greatly perplex
flunk — fail
foibles — minor failing or eccentricity
folderol — trivial fuss
furbelows — gathered strip or pleated border of a skirt
furtive — secretive
gallivant — gad about in pursuit of pleasure
gazebo — roofed garden structure
gazump — cheat a buyer in a house sale
gewgaw — useless or worthless things
glabella — area between eyebrows
glockenspiel — percussion instrument
glom — steal
gobbledygook — nonsensical language
gobsmacked — utterly astonished
goggles — protective eyewear
gubbins — small useless bits and pieces
hogwash — ridiculous
hoi polloi — the common people
hoity-toity — snobby, haughty
hootenany — informal party with folk music
hornswoggle — cheat or deceive someone
indubitably — without a doubt
jalopy — old broken–down car
jerboa — desert rodent
jiggle — shake, wriggle
kazoo — small wind instrument
kerfuffle — commotion or fuss
knickerbockers — pants gathered at the knee
kumquat — small citrus fruit
liripoop — string on graduate's hat, or a smart trick, acuteness
logorrhea — tendency to talking to much
lugubrious — looking mournful and gloomy
masticate — chew food
mollycoddle — overindulge or overprotect someone
morass — boggy ground
namby-pamby — weak, feeble
niggle — cause slight but constant annoyance
nincompoop — stupid or silly person
oblong — having an elongated shape
occiput — back of the head
peeve — irritate
periwinkle — flower
petcock — small valve in steam engine or boiler
phalange — finger bone
philtrum — groove above top lip
pilcrow — paragraph mark
pinking shears — scissors that cut a zigzag edge
pluck — pull out quickly, or courage
poppysmic — the sound of smacking lips
quack — the sound a duck makes
quaff — drink quickly
quagga — extinct South African zebra
quibble — slight objection
quokka — Australian short-tailed wallaby
rapscallion — mischievous person, rascal
razzamatazz — showy, exciting, loud spectacle
rhubarb — plant whose stems are eaten as a fruit
rickshaw — two—wheeled vehicle pulled by a person
samovar — Russian tea urn
sassafras — North American tree, flavouring
schnitzel — thin fried crumbed meat
shenanigans — secret activity, mischief
shrubbery — a bunch of small bushy plants
skedaddle — run away
skirt — woman's garment
snarky — cutting, critical
snickersnee — long knife
snorkel — swimmer's breathing tube
snout — animal's nose and mouth
sousaphone — type of tuba
spam — tinned meat brand, or irrelevant junk emails
spew — expel rapidly in great quantities
spry — lively
squabble — noisy quarrel over something trivial
squeegee — window cleaning tool
tittle-tattle — gossip
toupee — small wig
turducken — a turkey stuffed with a duck, stuffed with a chicken
turgid — swollen and distended, or pompous language
volvox — spherical microbe
wharf — pier where a ship can be moored
widdershins — counterclockwise direction
winkle-pickers — shoes with long pointed toes
zaftig — having a pleasingly curvaceous figure