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bittersweet	tasting sweet and bitter at the same time or successively. [1/5 definitions]
brood	a group of young birds or other animals hatched or born at the same time to one mother. [1/7 definitions]
by oneself	alone or without help (often used with other reflexive pronouns for the same meaning).
by-play	less important action that takes place at the same time as the main action, esp. in a play.
by the same token	for the same, or a similar, reason.
call around	to make phone calls to different people asking the same question of each.
can opener	a hand-operated device used for opening cans, or an electrical device used for the same purpose.
carp²	any of several fishes of the same biological family, such as the goldfish. [1/2 definitions]
carpool	an arrangement among a group of automobile drivers, such as employees at the same workplace, to take turns driving each other to and from a common destination. [1/3 definitions]
catch up	to reach the same distance or level as another or others who are further ahead (usu. fol. by "to" or "with"). [1/3 definitions]
chain store	one of a group of retail stores that are under the same ownership or central management system and that follow a uniform marketing policy.
chant	a song, esp. one which is sung on the same note or few notes throughout. [1/7 definitions]
chord²	three or more musical tones played at the same time. [1/2 definitions]
chorus	a speech or other utterance made by a number of people at the same time. [1/6 definitions]
circle	a closed curve along which every point is the same distance from a fixed center point. [1/8 definitions]
clan	a group, often large, of people from the same family. [1/3 definitions]
class	students who graduate in the same year. [2/8 definitions]
classmate	a person in the same class at a college or school.
class rank	a student's position on a list ordered by grade point average of all students in the same grade or year at a school.
clinic	an office facility shared by several doctors, usu. in the same specialty. [1/4 definitions]
closed primary election	in the United States, a direct primary election in which voters must show evidence of their party affiliation and may vote only for candidates of the same party.

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