She's telling you to hold still. She wants to take the leeches off your back.
4 seconds sound clip from the The Bridge on the River Kwai movie soundboard.
You can hear this line at 01:45:09.020 in the Blu-ray version of the movie.
Quote context
[...]
- I know how you feel, but there's always the unexpected, isn't there?
- Leeches.
- She's telling you to hold still. She wants to take the leeches off your back.
- What's a nice girl like you doing in a place like this?
- I'll teach you to say that in Siamese, if you like.
- Too much talk always spoils it.
- What's wrong with that thing?
- I don't know, sir. It's taken an awful beating. I can't seem to get a strong signal.
[...]