The verb ‘to lump’ means ‘to put up with ungraciously’. This is the answer to
anyone who complains about something that is unavoidable.

> ‘We’ve missed the last bus, so we’ll have to walk home.’

> ‘You don’t expect me to tramp three miles in the rain, do you?’

> ‘There’s no help for it. It’s the only way of getting home, and if you don’t
like it you can lump it.’