ACROSS

1 Type of boat lodged in Niagara Falls for more than 100 years

  5 Rapper's rhythmic pattern

  9 Gem with a play of color

 13 Hedging words in an estimate

 14 Big game venue

 15 Fancy fabric spelled with the same consonants as "limo"

 16 "Midnite Vultures" singer-songwriter

 17 Perfect pair

 19 Word before "lettuce" or "cucumber"

 20 "For real?"

 21 Moralistic types

 23 Drink like a cat

 24 British bathroom

 25 Shows excess concern

 26 Room littered with dirty clothes, e.g.

 27 Sleep disorder

 28 Able to be tried

 29 Edge of a hat

 33 Made with more than just Nestle Toll House chips, say

 36 Certain gender-fluid person, for short

 37 Where insults are said to stick

 38 Voltaire, religiously

 39 One might be personal or technical

 40 Talks immodestly

 41 Donkey

 44 Korean American actor Philip

 45 Forum regular who doesn't post messages

 46 Damage control experts

 49 Not trans

 51 Prime time?

 52 Apiece

 53 A single time

 54 Vowels in "Old MacDonald"

 55 Site such as Fandom

 56 Wetland growth

 57 Not as much

 58 Singer born Eithne Padraigin Ni Bhraonain

DOWN

1 Weeps

  2 Furtively approach

  3 Academy slight

  4 Moo goo gai pan pan

  5 Worries

  6 Remini of "The King of Queens"

  7 Product line?

  8 "Hold on!"

  9 Minnesota's St. ___ College

 10 Like the Holy See

 11 BP subsidiary

 12 Resulted in

 14 Vaulted recesses of churches

 18 They should last 10-20 minutes, per many sleep experts

 20 Perfect

 22 Lead-in to a cooking date?

 25 Become dim

 26 Taj ___

 28 Certain ponytail holder

 29 Dreary

 30 Create a disturbance

 31 "Hard to know what to do"

 32 Citi Field players

 34 Lodging that may be LEED-certified

 35 Noble gases lack them

 39 Beanie Babies and Wordle, for two

 40 Southwestern pack animal

 41 In regard to

 42 Book title spot

 43 "Well, ___ you asked ..."

 45 Designer Vuitton

 47 Have to have

 48 "Little piggies"

 50 Twelvers' Islamic branch

 52 Lamb's mom