“I'm soimech on the Mashgiach when I eat in that restaurant.” (Weiser)

“At the pool, you have to be soimech on the lifeguard to protect you.” (Weiser)

“He was soimech on the Shulchan Aruch for the psak.” (Weiser)

"An example is a litvishe using chasidim to be soimech on to miss zman krias shma." (source)

"So why in some cases of halacha do you make allowances to be someich on a shitas yachid for hefsed merubah and in other cases not?"