Definition
To allow someone to take something for themselves as they wish.
自行取用
If you'd like something to drink, please help yourself.
如果你想喝點什麼，請自便。
There is plenty of food at the party, please help yourself.
派對上有很多食物，請自便。
You don't need to ask me, please help yourself to the cookies.
你不用問我，請自便拿餅乾。