2 year old's dad keeps swearing infront of her

[Frazzels]

A while ago 2 year old DD blurted out "fuck sake", just after being with her dad, who I'm no longer with. I'm always careful about what I say in front of her and it really shocked me to hear from her. Then a few days later he swears whilst she's in the room, I tell him not to in front of her but he thinks it's "just a word" which i agree with to extent but there's an appropriate time and place. Since then DD's been saying "fuck" regularly, it's embarrasing to take her out and doesn't help that DD1 and DS find it hilarious and keep encouraging her. I've tried ignoring it but she's clearly picked up on the fact that she shouldn't be saying it. I know she's picked it up from her dad, it can't be anyone else, I'm with her most the time and if I'm not she's usually with him

Bump

I'd really hate this too, and I swear like a trooper.
It is really important socially that people are able to switch register, so I swear (descriptively - not vocatively) with DH and friends , and now my adult daughter, but I didn't swear as a teacher, in front of my children and I don't swear around my mother or in public places where there are random strangers.
At 2 years old, your DD cannot code/register switch and shouldn't be exposed to that language, particularly as it normally expresses irritation or anger. It sounds really awful when you hear adults using bad language around small children and I find it upsetting.
Of course most parents have a funny story of their small child using a swear word unexpectedly and embarrassingly, - but it's only funny if it is a rare and unexpected incident or phase.
Ignore her when she does it, if she uses it when asking for anything, or while you are doing something nice, stop, if you can, and stay silent, when she asks you to start/why you have stopped, say you don't play/help people who use ugly language. as soon as she says sorry, then back to normal.
Talk you her siblings when she isn't around and get them to help you with this.