simxu -sim-si'u- gismu

x₁ (set) has members who mutually/reciprocally x₂ (event [x₁ should be reflexive in 1+ sumti]).

Members of x₁ do to each other/one another x₂, and in return do x₂; x₁ (plural set) do the same thing x₂ to each other. See also kampu, mintu.

jbovlaste

In notes:

kampu: x₁ (property - ka) is common/general/universal among members of set x₂ (complete set).
mintu: x₁ is the same/identical thing as x₂ by standard x₃; (x₁ and x₂ interchangeable).
basysi'u: x₁ (plurality/set) replace/trade places with one another in circumstance x₂.
cajysi'u: s₁ (set) mutually exchange/trade/barter commodity c₂ for c₃ with c₄.
cpesi'u: x₁ ask each other for/request from each other x₂ in manner/form x₃
da'arsi'u: s₁ fight [each other] over issue d₃ (abstract).
djusi'u: x₁ (plural) help each other doing x₂
fuzysi'u: x₁ (set of individuals) are mutually accountable to each other for x₂ (action/resulting state) and act as each other's judge/authority.
jalsimgau: g₁ [agent/person] claps together/causes to collide/strikes together s₁
jalsi'u: s₁ (set) collide with each other.
jonsimgau: g₁ [person/agent] join s₁ together.
jonsi'u: x₁ are joined at/by x₂.
kucysimgau: g₁ folds/crosses/intertwines s₁(set).
mitybe'isi'u: s₁ (set) mutually synchronize b₂ via transmission means/medium b₅
nelsi'u: x₁ (set of individuals) are mutually fond of/like each other.
pamsi'u: x₁ love each other; x₁ are in love
papsimbi'o: x₁ make up/peace with each other under condition x₂.
pedysi'u: x₁ are friends (of each other, distributively)
pensi'u: x₁ (set) meet at x₂ (location).
selfai: f₂ shares f₁ with portions f₃.
selfu'esi'u: x₁ (action/resulting state) is the agreed-upon commitment for which x₂ (set of individuals) hold each other mutually accountable, acting as each other's judge/authority.
siktysi'u: x₁ (plurality) interacts in manner x₂
simbasti: x₁ trades places with x₂ in circumstance x₃.
simbi'o: x₁ (plural) become mutual in property x₂ (ka).
simda'a: x₁ fight [each other] over issue x₂ (abstract).
simkarbi: x₁ compares x₂ (set/plurality) in property x₃ (ka), determining x₄ (du'u/state)
simpapybi'o: x₁ make up/peace with each other under condition x₂.
simpe'o: x₁ are friends [of each other].
simselnu'e: x₁=n₂ is an agreement/contract/treaty between x₂=n₁=n₃
simsikta: x₁ interacts with x₂ in manner x₃
simtermosygau: x₁ rubs x₂ together.
smisi'u: The members of x₁=simx₁ (set) resemble one another in property x₂=simx₂.
spesi'u: si₁ is/are married couple(s) under law/custom/tradition/system/convention sp₃.
ta'arsi'u: s₁ (set) discuss subject t₂ in language t₄.
tugysi'u: t₁=t₂=s₁ are unanimous / sharing the same view on t₃=s₂ (du'u).
xanjaisi'u: s₁ hold hands/are hand-in-hand.
sefsi: x₁ is/are related to itself/himself/herself/themselves by relation x₂
zu'ai (exp!): shows mutual activity between this place and the first place of the current bridi; members participating in the activity are put into the first place (that e.g. can be formed by connecting sumti with {ce} or {jo'u})
imxu: x₁ and x₂ do x₃ (binary ka) to each other.