opposit of keep step
keep
Liquid
Keep secret.
mother in law
The opposite of retain (keep) could be lose or dispose of. The opposite of retain (hold) would be release, free, loosen, or unsecure.
"Step-brother" is a noun and does not have an opposite.
"Step-brother" is a noun and does not have an opposite.
A failed step
Take
Hold or keep
Liquid
keep
To endanger
The opposite or antonym applicable to the term channel is hold or keep.
The opposite of return would be departure. The opposite of return (something) would be to keep it. The opposite of the noun return (on investment) would be cost.
because you do the opposite
keep