You think there are not enough people or other resources to get your job done well.
“I'd like to do that feature for this release, but there's not enough time.”
“Sorry, not enough resources for that date. Gotta give up something.”
“What feature do you want me not to do?”
“...but not enough (headcount/time)...whaddya gonna do?”
“Given our constrained resources, it was a good effort.”
People often see a shortage of resources where no such shortage really exists. Problems are then misdiagnosed as being caused by too little time or too few people, or both, and wrong strategies are subsequently employed. This misperception is continually reinforced.
 Usually you can't say that you need more “people,” but you can ...