A dime a dozen

something that is very common or easy to get

Make a clean breast of

tell the truth; confess

A drop in the bucket

a very small or insignificant amount

Call it a day

to stop working on something, usually because you are tired or satisfied with the progress

Cut someone some slack

to give someone more freedom or leniency than usual, usually because they are having a hard time or are new to something

Hit the nail on the head

to say or do something exactly right

Hit the sack

to go to bed, usually because you are very tired

In hot water

in trouble or difficulty

Put something on ice

to postpone or delay something

Spill the beans

to tell someone a secret or information that was supposed to be kept hidden

The elephant in the room

an obvious problem or issue that no one wants to talk about

The icing on the cake

something that makes a good situation even better

The tip of the iceberg

a small part of a larger problem or issue that is not yet fully known or understood

A hot potato

a controversial or difficult issue that no one wants to deal with

A penny for your thoughts

a way of asking someone what they are thinking about

Cut to the chase

to get to the point without wasting time

Jump on the bandwagon

follow a trend; do what everyone else is doing

Through thick and thin

throughout good times and bad times

Go the extra mile

to do more than what people expect

Cut the mustard

come up to expectations; reach the required standard

Throw caution to the wind

to stop thinking about something and take the risk

Jump the gun

to act on something promptly before the right time

A snowball's chance in hell

no chance at all

To be down in the dumps

to be sad

To be buzzing

to be excited or happy about something