Meaning trap
get back
retaliate
To do something to someone because they have done something harmful to you; to take revenge.

Don't mix these meanings
Same phrase, different job.
To do something to someone because they have done something harmful to you; to take revenge.
'get back' also has the more basic meaning 'return'; this is the advanced sense.
Hear it in context
Notice where the phrase sounds natural.
She finally got back at her colleague for spreading those rumours.
While some people believe in turning the other cheek, others feel compelled to get back at those who have wronged them, which can perpetuate cycles of conflict.
Fix the pattern
One small grammar move makes it sound right.
Not: He wanted to get back to her for cheating.
Say: He wanted to get back at her for cheating.
For revenge it's 'get back AT someone' — 'get back to' means reply/return.
Which sounds natural?
Tap the one a native speaker would say.
'Get back at someone' is the natural phrase for revenge; 'take revenge on' is dramatic and formal.
Build natural chunks
Words that usually travel with it.
get back at + person
- at him
- at her
- for it
- somehow
Don't confuse it
Related
Other meanings and phrases to compare.
- get back (return) — 'get back' also has the more basic meaning 'return'; this is the advanced sense.