שמרטף

From שמר‎ (shamár, “to guard; (hence, by extension) to keep”) +‎ טף‎ (taf, “babies, infants, small children”).

שְׁמַרְטַף • (sh'martáf) m (plural indefinite שְׁמַרְטַפִּים‎, singular construct שְׁמַרְטַף־, plural construct שְׁמַרְטַפֵּי־‎, feminine counterpart שְׁמַרְטַפִּית‎)

1. A (male) babysitter: a (male) person who takes care of one or more infants or children.

• (babysitter): בייביסיטר‎ (beibisiter), שומר טף‎ (shomér-taf)

From the above, via the root ש־מ־ר־ט־ף‎ (sh-m-r-t-p).

שְׁמִרְטֵף • (sh'mirtéf) (pi'el construction)

1. To babysit: to act as a babysitter (for).

שְׁמֻרְטַף • (sh'murtáf) (pu'al construction)

1. defective spelling of שמורטף‎.

• “שְׁמַרְטַף” in Abraham Even-Shoshan (אַבְרָהָם אֶבֶן־שֹׁשָן) et al., הַמִּלּוֹן הֶחָדָשׁ‎ (ha-milón he-khadásh, “The New Dictionary”), Kiryat-Sefer Ltd. (קִרְיַת־סֵפֶר בְּע״ם)‎ (1984), →ISBN, volume 3 of 3 (ק to ת), page 1389.