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toughen : strengthen
Urge
Criminal police officer
Come and go
Assert : Deny what would that analogy be?
toughen : strengthen
Reproach : praise completes the analogy.
I can do
Urge
Help
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.
Snarl grow
Reproach praise
entreaty : plea