The phrase "out of kilter" refers to something that is not working properly or is not in its proper place. There are several synonyms for this phrase, including "out of whack," "out of sync," "out of balance," "off-kilter," and "misaligned." All of these phrases suggest that something is not quite right and needs to be adjusted in order to function properly. When something is "out of kilter," it can be a minor inconvenience or a major problem, depending on the situation. It is important to promptly address any issues that are "out of kilter" in order to prevent further damage or complications.