firm, be(come)கெட்டியாகுkeṭṭiyāku(geṭṭi aahu)(3b intr)become hard, strong, or certain; become solid; become wiry, as body, muscles, etc.; firm up, become established; settle down; set, as cement, plaster, etc.
Usage:
சாதம் மிகவும் கெட்டியாகிவிட்டதுcātam mikavum keṭṭiyākiviṭṭatu
saadam romba geṭṭi aayiḍuccu
The rice has become very firm.
grow toughகெட்டியாகுkeṭṭiyāku(keṭṭiyaahu)(3b intr)toughen or harden; solidify
Usage:
கோழி முட்டையின் ஓடு கெட்டியாக வேண்டும். இல்லையென்றால் முட்டை பிழைக்காதுkōḻi muṭṭaiyiṉ ōṭu keṭṭiyāka vēṇṭum. illaiyeṉṟāl muṭṭai piḻaikkātu
kooḻi muṭṭeyooḍa ooḍu keṭṭiyaahaṇum. illeeṇṇaa muṭṭe poḻekkaadu
The shell of a chicken's egg needs to grow tough and hard, or the egg won't survive.