touch off (something) or touch (something) off
to cause something to fire or explode by lighting the fuse
The fire at the oil refinery touched off an explosion that destroyed many tanks.
Enjoy Christmas Day
Give your time
If you know people who have young kids, gift a baby sitting voucher if you have a friend who wants to learn to sew, or knit, offer to teach them in the New Year if you have an older relative with a large garden, gift them a couple of hours of gardening time.
