係

verb: to relate to, to concern, to be connected with
關係, 涉及

Etymology 1 groups several senses (relate/bind, copula 'to be', affirmative 'yes') under the hi6 reading, but the copula and 'yes' senses are specifically labeled Cantonese/Hakka rather than Teochew, so the exact Teochew usage is uncertain; the more general 'relate/connect' sense was chosen as the safest fit.