Translation of "Slipping" in Japanese

Am I slipping?

俺って腕が鈍ったかな？

The sales are slipping.

売り上げが急に落ちている。

I do not want to step on it. -[rope slipping] -[clattering]

踏みつけたくはない

The world's largest land mammal slipping right through the center of town.

‎地上最大の哺乳類が ‎町の中心を横切る

Oh, that's a secret, OK? Because slipping out of the dorm in the night is severely punished.

あ、みんなには内緒だよ？寮を夜中に抜け出すのは厳罰だからね？