This is the 6586th most frequent Japanese word.
トク
"トク" (toku) means "benefit," "advantage," or "profit" in English.
Here, 'トク' implies 'advantageous' or 'something of benefit', especially in the context of an action yielding positive results.
健康のために運動するのはトクだ。
Exercising for health is beneficial.
In this usage, 'トク' indicates a resulting benefit or advantage deriving from a situation or proposal.
その提案は結局、彼にとってトクになった。
That proposal eventually turned out to be advantageous for him.
In this sentence, 'トク' is used to mean 'beneficial' or 'a good deal', often related to a purchase or opportunity.