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| slot into groove (andreon) | |||
| mount one's favorite hobbyhorse (Сomandor); get on one's hobby-horse (Wakeful dormouse); get on one's soapbox (Once Grandpa got on his soapbox about the local election, I found an excuse to slip out of the room. 4uzhoj) | |||
| be on a roll (My mother loved to gossip, and she had a hard time stopping once she was on a roll. • Not only can he tell you where this is going, and how you'll get there, but there's simply no stopping him once he's on a roll. 4uzhoj) | |||