This is the 7449th most frequent Japanese word.
倒さ
"倒さ" is the stem form of "倒す" (taosu), meaning "to knock down" or "to defeat."
In this sentence, '倒さ' is used as part of the verb '倒す,' which means 'to defeat' or 'to overcome.' It indicates an action of conquering an opponent.
彼は敵を倒さなければならない。
He must defeat the enemy.
Here, '倒さ' is part of '倒す,' meaning 'to knock down' or 'to fell.' It is used in the context of cutting down or physically knocking over a tree.
この木を倒さないでください。
Please do not cut down this tree.
In this sentence, '倒さ' again relates to '倒す,' with the subject being passive (倒される) indicating it was acted upon and knocked down by strong winds.