A reciprocal construction (abbreviated RECP) is a grammatical pattern in which each of the participants occupies both the role of agent and patient with respect to the other.
Reciprocal constructions can be said to express mutual relationships.
For example, Turkish reciprocal constructions which might also have slightly different meanings than the verbs they originate from, have the suffix -iş (-ış, -uş or -üş depending on the vowel harmony): Other languages, including English, use reciprocal pronouns such as "each other" to indicate a mutual relation.
Most Indo-European languages do not have special reciprocal affixes on verbs, and mutual relations are expressed through reflexive constructions or other mechanisms.
For example, Russian reciprocal constructions have the suffix -sja (-ся, 'self'), which also has reflexive and passive interpretations.