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(1)

if they do get stuck with the fake bills, they'll try and pond it off on you.

(2)

She said she thought that the store keeper knew that the bread was molded and was glad to pond it off on some poor travelers.

(3)

LETTERMAN: Do you ever think to yourself, " I know I'm goona get up now, but I don't know if i'm gonna get up next year." Do you think about stuff like that?
MICHAEL DOUGLAS: Well, i find ways to sort of pond it off.

<above is what I heard, it's not an acurate transcript>

"pond it off"

what does this mean? is this an idiom?

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pawn, not pond.

pawn off: to get rid of or pass off usually by deception (www.m-w.com)

Also, palm off.

(I don't think you've got the third example right. It may have been very context-dependent. It doesn't fit with the other two, which definitely fit the verb pawn off.)

CJ
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akdomthe store keeper knew that the bread was molded
Moldy, not molded.