Thx all. Full hand:
I don't quite understand West's "no preference", but ok.
As mikeh, I sensed red flags all around, so I opted for a conservative 3
♣, hoping that pard would put me back in diamonds with a preference there (which I would raise). His hand is somewhat unattractive, so he ended up not supporting the clubs. I probably would have bid 4
♣ in his place because of the likely "spade ace to singleton". Definitely a minor suit game you'd want to be on, but this one requires some unlikely guesswork on clubs (defenders let me discard the heart loser though).
A difficult hand anyway, as anything you bid over 2
♠ may turn out right or wrong. And indeed at the other table opps lingered in 3NT, -3 on a heart lead.
In the end I asked opps "why pass 2
♦ with 4 diamonds if a 6-4 across is unlikely?". Back came "well, with 5 diamonds pard can redouble." I was left thinking who let the Rueful Rabbit out of its hole...
IMPS
2♦ = multi
Dbl = bal 12-14 or any 18+ (a 2M overcall would be short suit takeout)
Pass by west = 4+ diamonds, no preference for a major
Pass by north = "I got more diamonds than joo."
Pass by south to 2♠ = nothing special to say. Dbl would be takeoutish for the minors.
Bid? (check pool for meanings of bids)