lucky loser 本線を棄権した選手が出て本戦に出場できる選手

come out swinging 強気に出る

I’m expecting her to be really dangerous and come out swinging so it’s going to be a really tough match.”

BBC

立場が逆転する　the boot will be on the other foot

On Sunday, the boot will be on the other foot at Wimbledon.

BBC

https://www.bbc.com/sport/tennis/articles/c047zyrlxmlo?xtor=AL-72-%5Bpartner%5D-%5Bbbc.news.twitter%5D-%5Bheadline%5D-%5Bnews%5D-%5Bbizdev%5D-%5Bisapi%5D&at_link_type=web_link&at_ptr_name=twitter&at_medium=social&at_bbc_team=editorial&at_link_origin=BBCNews&at_format=link&at_campaign=Social_Flow&at_link_id=F6BB468C-3C20-11EF-AC47-E63A9A3945E7&at_campaign_type=owned

mouser ネズミをとる動物

https://www.bbc.co.uk/newsround/articles/c51yvy429djo.amp