The phrase "about to be trapped" is correct and usable in written English.
It can be used to describe a situation where someone or something is on the verge of being caught or confined.
Example: "As the hunter approached, the animal sensed danger and realized it was about to be trapped."
Alternatives: "on the brink of being caught" or "nearly ensnared".
A few days later Smith walked out, afraid he was about to be trapped.
At this point adults may fear that they're about to be trapped in an hourlong Taco Bell commercial.
At the end, tremolo strings glisten like the threads of a spiderweb in which Gilda is about to be trapped.
Mind you, I wasn't panicking because I was stoned retarded and about to be trapped in a car with a lame-wad Desi family member.
The 2nd Division of the XII Corps, under George Sears Greene, however, broke through McRae's men, who fled under the mistaken belief that they were about to be trapped by a flanking attack.
Luckily people were (at least in my experience) as polite as possible when bumping into others and foot traffic moved quickly enough that I never felt as though I was about to be trapped in a quagmire of warm bodies and holiday cheer.
They showed just how politically involved young people are, that we care enough about the issue to be trapped for hours and hours in the cold.
He said rescuers were still searching for about 20 people believed to be trapped, but had heard no cries, taps or noises for a while.
About 400,000 residents are believed to be trapped in Eastern Ghouta, a former agricultural district situated about 9 miles east of Damascus that is the last major rebel-held pocket near the Syrian capital.
About 400,000 people are believed to be trapped in besieged rebel-held pocket near the Syrian capital Damascus, weathering a brutal offensive by the regime and its allies that has killed more than 560 people in just thr past weeks, while struggling to survive acute shortages of food and medicine.
She says she is not going to be trapped into "gotcha games" about personal habits.
