poles apart

bare poles

The condition of a sailing boat when all of its sails have been taken in.

come apart at the seams

Synonym of fall apart.

drift apart

To lose contact, to lose one's friendship or closeness.

fall apart

To be emotionally in crisis.

grow apart

To gradually become estranged.

pick apart

To review or analyse in great detail

tell apart

To perceive things as different, or to perceive their difference itself; to differentiate, distinguish, discriminate.

worlds apart

Vastly different.