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Criminal police officer
Urge
toughen : strengthen
Come and go
Assert : Deny what would that analogy be?
Criminal police officer
Reproach : praise completes the analogy.
I can do
Help
Urge
Drawback
guard : sentinel
soothe
The answer to the analogy "taboo is to forbidden as cheerful is to" would be happy. Taboo and forbidden are synonymous in meaning, so cheerful and happy would be the appropriate pair in this analogy.
Reproach praise
entreaty : plea
toughen : strengthen