ichi.moe - Japanese transliteration and dictionary service

Compound word: しっかり + して

しっかり

[adv,adv-to,vs] tightly (holding on); firmly; securely
[adv,adv-to,vs] strongly (built); solidly; sturdily; steadily
[adv,adv-to,vs] properly; well; sufficiently; hard (working, etc.); fully; completely
[vs,adv-to,adv] reliably; dependably; levelheadedly; shrewdly; wisely; cleverly

して

[makes a verb from a noun]

[vs-i] Conjunctive (~te)