相互

Matter and energy are interconvertible.

Our previously opposed views are beginning to converge.

The two boys exchanged their baseball caps.

They have a reciprocal loathing for each other.

correspond with each other for years

depend/rely on each other

learn from each other

reinforce each other

repel each other; be mutually exclusive

pitch into/grapple with each other

compete with each other

correlate with/to; be correlative; be related/connected to each other; be interrelated

cancel each other out

size each other up; look at each other up and down

be suspicious of each other

mutual complementation

help/shield/respect each other

The essays do not interrelate very adequately.

Their partnership was based on mutual respect, trust and understanding.

The two countries reached a reciprocal trade agreement.

interrelations of historical events

improve the mutual relations (between)

reciprocal consideration