sixth sense
for the umpteenth time
opportunity knocks but once
at the eleventh hour
third degree
first come, first served
third time lucky/third time's a charm
play second fiddle (to sb/sth)
a third wheel
second nature
we should take an opportunity (or chance) when it comes. According to this saying, it will not come again.
asking serious questions and/or giving somebody a rough treatment to get information from them.
having a less important position than somebody/something else.
doing something at the last possible moment.
being the third person in a group or situation where there are already two people who are romantically involved.
something that becomes automatic or natural due to practice.
people will be dealt with or given sth in the order in which they arrive.
used to say that two efforts at something have already failed, but perhaps the third will be successful.
a special ability to know something without using any of the five senses that include sight, touch, hearing, smell, or taste.
it happens again after having happened many times before – used when you are annoyed that it has happened so often.