Where does “hết sức” come from?

hết sức (Vietnamese) comes from Vietnamese sức, from Proto-Vietic k-rək, from Old Chinese 力.

hết sức (Vietnamese): with all one's might, with all one's strength;...

Definitions

  1. with all one's might, with all one's strength;...

Ancestry of “hết sức”, step by step

hết sức traces back through two separate lines of ancestry.

via Vietnamese sức

StepLanguageWordMeaning
1Vietnamesesứcstrength; power
2Proto-Vietick-rəkstrong
3Old Chinese力—

via Vietnamese hết

StepLanguageWordMeaning
1Vietnamesehếtto finish, to end, to expire, to come to an end;...
2Proto-Vieticheːtfinished
3Proto-Mon-Khmerʔət—
Every word from Old Chinese 力 →Every word from Proto-Vietic k-rək →Every word from Vietnamese sức →