for fear of

for fear of (something)

Because one is afraid of something or that something will happen. We closed the shop early for fear of the impending snow storm.
See also: fear, of
Farlex Dictionary of Idioms.

for fear of something

out of fear for something; because of fear of something. He doesn't drive for fear of an accident. They lock their car doors for fear of being attacked.
See also: fear, of
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

for fear of

Also, for fear that. In order to avoid or prevent, in case of. For example, They closed all the windows for fear of rain. The variant is always used before a clause, as in She wouldn't let her children climb trees for fear that they would fall. The first term dates from the late 1400s, the second from about 1600.
See also: fear, of
The American Heritage® Dictionary of Idioms by Christine Ammer.

for fear of something/of doing something

,

for fear (that)...

because you do not want something bad to happen: I’m not going to put it in the washing machine for fear of spoiling it. I had to keep my opinions secret for fear (that) I would lose my job.
See also: fear, of, something
Farlex Partner Idioms Dictionary
See also:
  • for fear of (something)
  • for fear of something/of doing something
  • be in fear of (one's) life
  • be/go in fear of your life
  • fear
  • go in fear of (one's) life
  • in fear and trembling of (someone or something)
  • in fear and trembling
  • tremble
  • Iraqnophobia