Wordy wise

TIPPING PINT — angling the glass to get the beer into the mouth. SIPPING POINT — the edge of the glass nearest to you. TRIPPING POINT — the raised edge of a broken paving slab.

DIPPING POINT — the tube the stick is inserted into for assessing vehicle’s oil level. ZIPPING POINT — trouser front.

Dave Cullen, Alwoodley, Leeds.