What it means
A very British way to say someone’s a bit slow, not quite clocking what’s obvious, or taking ages to catch on. It’s usually a softer dig than stupid or thick, more eye-roll and cheek than proper venom. You’ll often hear it with a grin, a sigh, or a little bless-him flavour.
Usage examples
"He said he’s nipping to Cardiff for the seaside. I went, mate, it’s miles from the coast. He’s a bit dim, bless him."
"Bless him, my nephew is a bit dim with the maths homework but absolutely brilliant in the kitchen."
"The new lad on the till is rather dim, he gave me change for a fifty when I had paid with a twenty."
"Don't ask Kev to work out the split on the taxi fare, he's a bit dim till he's had a coffee."
"I told her the shop shuts at six and she turned up at half six anyway. Bit dim, that."
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Where it comes from
This comes from the everyday English adjective dim, meaning not bright. In British English it’s long been used figuratively for someone who seems slow-witted or not fully switched on. The joke hangs on the old bright means clever idea, so if someone’s dim, the mental bulb isn’t giving full wattage.
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