Hasati & Hassati

  1. to laugh, to be merry; pres hasati Bv.i.28; Mhvs.35, Mhvs.59; hassati Snp.328, Snp.829;
    ppr hasamāna is preferable variant reading at Ja.iv.281 for bhāsamāna
    aor hasi Ja.ii.103; Dhp-a.ii.17
    caus hāseti [i.e. both fr. has & hṛṣ ] to cause to laugh; to please, to gladden Mhvs.32, Mhvs.46; Ja.vi.217, Ja.vi.304; Dhp-a.ii.85;
    aor hāsesi Vin.iii.84;
    ppr hāsayamana making merry Ja.i.163, Ja.i.209 Ja.i.210;
    ger hāsayitvāna Mil.1
    caus 2 hāsāpeti Snp-a.401; Ja.vi.311. Cp. pari˚, pa˚.
  2. to neigh (of horses) Ja.i.62; Ja.vi.581
    ■ strange aor. hasissiṃsu, explained as hasiṃsu by C.
    pp hasita (& haṭṭha).

owing to similarity of meaning the two roots has to laugh (Sk. hasati, pp. hasita) & hṛṣ to be excited (Sk. hṛṣyati, pp. hṛṣita & hṛṣṭa) have become mixed in Pāli (see also hāsa)
■ The usual (differentiated) correspondent of Sk. hṛṣyati is; haṃsati. The Dhtp (309) gives haṃsa (= harṣa) with tuṭṭhi, and (310 hasa with hasana