get (your) tongue around/round (something)

to pronounce a difficult word or phrase.

I just can't get my tongue around some of those Welsh place names.

• on all fours
• on an empty stomach
• on an even keel
• on a par with
• on a par with someone
• on a par with something
• on a roll
• on a shoestring
• on a silver platter
• on a slippery slope
• on a tangent
• on automatic pilot
• on a wing and a prayer
• on back
• on balance
• on behalf of
• on behalf of someone
• on bended knee
• on bended knees
• on best behavior
• on blocks
• on board
• on borrowed time
• on call
• on case