I touched his arm.

Tough luck!

Tough bananas!

tough choice

tough customer

tough job

tough nut to crack

tough shit

tough sledding

Tough!

to tough it out

as tough as leather

as tough as old boots

to be a tough cookie

A tough act to follow

to be touring

a tourist attraction

to tow a car to the garage

a tower of strength

town bike

to be in town

I'm in town.

town centre

to go to town on/with something

to toy with an idea