nounBritish • trademark
- Men’s or boys' underpants with a branching seam at the front in the shape of an upside-down Y.More example sentences
- They'll be donning capes and Y-fronts over their trousers.
- He's over in the kitchen area, wearing nothing but his hat and a baggy pair of Y-fronts.
- Every man and his brother buys their Y-fronts at this shop.