Any others?

[derrynoose]

"Slow up" and "Slow down" mean the same thing. Any other phrases like these?

[dundurn]

'Luck in' and 'Luck out'

[dundurn]

'Drive off' and 'Drive on'

[scakebread]

Not a phrase, just a word: FLAMMABLE and INFLAMMABLE.

[dundurn]

Same with 'habitable' and 'inhabitable'

[Quizmonkey]

Fill in and fill out (as in forms) but that's a UK/US distinction (originally).

[kaw69]

Surely dundurn is wrong with 'habitable' and 'inhabitable'
habitable means can be lived in whereas inhabitable means cannot be lived in

[squarebear]

No dundurn is correct. You are thinking of uninhabitable.

[drummo]

a tree, first you chop it down then chop it up

[kaw69]

Thanks squarebear I GOT IT WRONG been working overtime a lot lately caught me out completely going to bed now bye bye

[juandelacruz]

"Drive off" is from rest. "Drive on" is when you've been moving and have slowed down or come to a temporary halt.

There seem to be a few people from the USA on this site and they'll get in a right old two-and-eight, since many of their modal verbs use different prepositions, e.g. hang in, when we say hang on.