Les actions (nfpl):
As well as English ‘actions’, ‘les actions’ also mean ‘shares’ as in stocks and shares. Now where did I put my Swiss bank account…
Le tube:
‘Un tube’ or ‘le tube’ has many meanings but the (London) underground is not one of them. It can be used for a song that is or has been a great hit. ‘Le tube de l’année dernière’ is ‘last year’s (big) hit song’.