Revelle Humanities Grammar Handbook
6 Sentence fragments
7 Run-on sentences
8 Verb agreement
13 Passive voice
15 ESL
17 Misplaced modifiers
18 Pronoun reference
20a Comparisons
21 Parallel construction
23 Commas
23d Sexist language
25/6 Semicolons & colons
29 Ellipsis
31 Brackets
35 Apostrophes
36 Abbreviations
37 Underlining
39 Numbers
41b Slang
41e Jargon
41f Pretentious language
42c Idioms
42e Clichés
43a Fluff

42c Idioms
Be sure to use idiomatic phrases accurately, since an incorrect use may be distracting -- or better yet, do not use them at all, since they often replace original thinking or act as filler.

Incorrect idiom: Until Polyphemos left, his cave was so quiet you could hear a mouse gasp.

Revised sample: Until Polyphemos left, his cave was completely silent, as Odysseus and his men cowered in fear.