if you give someone a pat on the back, you praise them for something good that they have done.

She deserves a pat on the back for keeping things going while you were away. (often + for)

• I plead the Fifth
• I plead the Fifth Amendment
• I rest my case.
• I rest my case
• iron out
• iron out something
• iron out the kinks
• irons in the fire
• irregardless of
• irregardless of something
• is all need
• is all you need
• is anyone's guess
• is at disposal
• is at your disposal
• is bag
• is beyond me
• I shudder to think
• is in business
• is not a bed of roses
• I stand corrected
• is that a fact
• is your bag
• I take my hat off to
• I take my hat off to someone