something that you say which means that it takes a long time to do an important job.

'Sometimes it feels like we've spent all our lives decorating this house.' 'Well, Rome wasn't built in a day.'

• one of the lads
• one of those days
• one-shot
• one step ahead
• One step forward, two steps back.
• one swallow doesn't make a summer
• one thing after another
• one thing leads to another
• one-to-one
• one-two punch
• one-upmanship
• on everyone's lips
• one way or another
• one way or the other
• one-way ticket to
• one-way ticket to something
• on feet
• on file
• on good side
• on good terms
• on good terms with
• on good terms with someone
• on guard
• on hand
• on head be it