a person or thing that one is extremely pleased or relieved to see.
"the mighty Cairngorms are a sight for sore eyes in any rambler's book"

to watch carefully for someone or something: Keep your eyes peeled for Polly and Maisie.

One whom it is a relief or joy to see, as in Linda, who had not seen him in 15 years, told him he was a sight for sore eyes. This idiom implies an appearance so welcome that it heals ailing eyes.

a person highly regarded by someone and treated with special favour.
"the problem that managers may favour their blue-eyed boys"

Very pleasing information, excellent news, as in So they're getting married? That's music to my ears.

wet behind the ears. Also, not dry behind the ears. Immature, inexperienced, as in How can you take instructions from Tom? He's still wet behind the ears, or Jane's not dry behind the ears yet. This term alludes to the fact that the last place to dry in a newborn colt or calf is the indentation behind its ears.

disadvantage oneself through a wilful attempt to gain an advantage or assert oneself.
"by cutting Third World aid to reduce public spending, the government would be cutting off its nose to spite its face"

(also poke/put your nose into something) infml to try to discover things which do not involve you: You're always sticking your nose into my business.

an act of helping someone or something to improve their situation.
"he gave hip-hop a much-needed leg-up"

If you do something by the skin of your teeth, you only just succeed in doing it: He escaped from the secret police by the skin of his teeth.

Get one's first experience by doing, or learn early in life, as in I cut my teeth on this kind of layout or He cut his eyeteeth on magazine editing. This term alludes to the literal verb to cut teeth, meaning “to have teeth first emerge through a baby's gums,” a usage dating from the late 1600s.