The first aorist stem is formed by adding the tense suffix -σα to the verb-stem: ἔ-λῡ-σα I loosed, λῡ́σω, λῡ́σαιμι; ἔ-δειξα I showed, from δείκ-νῡ-μι. See 666.
a. In verbs showing strong and weak grades (476), the tense-suffix is added to the strong stem: πείθω ἔπεισα, τήκω ἔτηξα, πνέω ἔπνευσα, ἵστημι (στα-, στη-) ἔστησα, ἐστησάμην.
N.—τίθημι (θε-, θη-) place, δίδωμι (δο-, δω-) give, ῑ̔́ημι (ἑ-, ἡ-) send have aorists in -κα (ἔθηκα, ἔδωκα, ἧκα in the singular: with κ rarely in the plural). See 755.