to tread on someone’s corns

to tread on someone’s heels

to tread water

to tread/skate on thin ice

to treasure someone above everything else

treasure hunting

to go on a treasure hunt

Treat your children with respect!

to be a treat

to treat with kid gloves

to treat oneself to something

to treat someone to something

to treat something lightly

to treat lightly

It is my treat

I treats him/her with great tenderness.

tree hugger

A tree must be bent while it is young.

tree of knowledge

tree of life

to be up a tree/up the creek

to trek

to tremble in one’s boots

to tremble like a leaf

to tremble like an aspen leaf