hold on to one's hat(an expression warning someone of a big surprise. This expression may allude, according to lexicographer Eric Partridge, to a wild ride on a rollercoaster; Am.E.: Hold your hat – we just won the lotteryTaras)
steer clear(Senior citizens are among the most vulnerable people to COVID-19. The few times I've been out of the house in the past few weeks, I pay particular attention to any elderly people around me. I steer clear and hold my breath as I pass by. (пример ART Vancouver) burnabynow.com)
steer clear of(You'd best steer clear of him, Manderley, he's a nasty piece of work. • Steer clear of the barn tonight. • I've been told to steer clear of you.joyand)