opt 
/ˈɑ:pt/ verb
opts; opt·ed; opt·ing /ˈɑ:pt/ verb [no obj] : to choose one thing instead of another — often + for ▪ He usually orders strawberry ice cream but opted for chocolate this time. — often followed by to + verb ▪ She was offered a job but opted to go to college instead. ▪ We opted not to buy the extra insurance.
opt in [phrasal verb]
: to choose to do or be involved in something
▪ The company offered a new health insurance plan so that more workers would opt in.
▪ The company offered a new health insurance plan so that more workers would opt in.
opt out [phrasal verb]
: to choose not to do or be involved in something
▪ Most employees participated in the pension plan, but a few opted out. — often + of ▪ A few employees opted out of the pension plan. — see also opt-out
▪ Most employees participated in the pension plan, but a few opted out. — often + of ▪ A few employees opted out of the pension plan. — see also opt-out
