Примеры употребления для up to something
1. "But then, after that, you realise everybody‘s up to something.
2. "No one thought or imagined that he was up to something.
3. I suspected that he was up to something and I informed my relatives and neighbors.
4. And it all adds up to something akin to your own bracing day at the theatre.
5. The Iraqi security forces are now up to something like 275,000.