1. to hit the nail on the head

to pound the nail on its top

to be right about something

to be optimistic

in addition to a main thing

2. to look on the bright side

to see the side that's bright or lit by sun

to be optimistic

in addition to a main thing

in most ways

3. on the side

in addition to a main thing

beside or next to

to tease someone

in most ways

4. on the whole

on top of the entire thing

in most ways

in addition to a main thing

to tease someone

5. can of worms

container full of bugs

complex problem

to tease someone

in addition to a main thing

6. to get off the ground

to make a successful beginning

to leave the earth

in addition to a main thing

to tease someone